CN110729702A - Controller - Google Patents
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- CN110729702A CN110729702A CN201911039390.2A CN201911039390A CN110729702A CN 110729702 A CN110729702 A CN 110729702A CN 201911039390 A CN201911039390 A CN 201911039390A CN 110729702 A CN110729702 A CN 110729702A
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- control unit
- leakage current
- rectifier bridge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
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Abstract
The invention provides a controller which comprises a power supply input end, a current transformer, a leakage current conversion unit, a leakage current protection control unit, a first resistor, a first rectifier bridge, a first capacitor and a motor drive control unit. The current transformer is used for detecting leakage current, and when the sum of currents induced by the current transformer is not zero, the leakage current protection control unit can turn off a controllable switch tube in the motor drive control unit, so that the effect of protecting a controller or a motor is achieved.
Description
Technical Field
The invention relates to the field of motor protection, in particular to a controller for motor leakage protection.
Background
At present, the motor is all installed to devices such as compressor, fan, water pump on the refrigeration plant, and the inventor discovers: for various reasons, such as poor insulation between the coil inside the motor and the housing, or contact between the damaged driving wire harness and the grounding metal, electric leakage can occur; in the running process of the motor, the leakage can not only cause the damage of devices, but also bring safety hidden troubles.
Disclosure of Invention
In view of this, the present invention provides a controller to solve the problem of potential safety hazard caused by leakage of a motor during the operation of the motor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a controller comprises a power input end, a current transformer, a leakage current conversion unit, a leakage current protection control unit, a first resistor, a first rectifier bridge, a first capacitor and a motor drive control unit;
the power supply input end is used for accessing a power supply;
the primary winding of the current transformer is connected in series between the power input end and the input side of the first rectifier bridge;
the first capacitor is connected with the motor drive control unit in parallel, and the motor drive control unit is used for being connected with a motor; the motor drive control unit comprises a controllable switching tube and a freewheeling diode connected with the controllable switching tube in parallel;
the first capacitor is connected to the output side of the first rectifier bridge, and the first resistor is connected between the power input end and the first capacitor;
a secondary winding of the current transformer is connected to a leakage current conversion unit, and the leakage current conversion unit converts a leakage current signal detected by the current transformer into a first voltage; and the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage.
Optionally, the current transformer comprises 2 primary windings and 1 secondary winding, wherein 1 of the primary windings is connected between the positive power supply and the first input terminal of the first rectifier bridge, and the other primary winding is connected between the negative power supply and the second input terminal of the first rectifier bridge; the leakage current conversion unit comprises a second resistor and a second rectifier bridge; the second resistor is connected with two ends of the secondary winding, the input end of the second rectifier bridge is connected with two ends of the second resistor, the high-voltage output terminal of the second rectifier bridge is connected with the leakage current protection control unit, and the low-voltage output terminal of the second rectifier bridge is connected to the ground.
A controller comprises a power input end, a current transformer, a leakage current conversion unit, a leakage current protection control unit, a first resistor, a first rectifier bridge, a first capacitor and a motor drive control unit;
the power supply input end is used for accessing a power supply;
the primary winding of the current transformer is connected in series between the motor drive control unit and the motor;
the first capacitor is connected with the motor drive control unit in parallel, and the motor drive control unit is used for being connected with the motor; the motor drive control unit comprises a controllable switching tube and a freewheeling diode connected with the controllable switching tube in parallel;
the first capacitor is connected to the output side of the first rectifier bridge, and the first resistor is connected between the power input end and the first capacitor;
a secondary winding of the current transformer is connected to a leakage current conversion unit, and the leakage current conversion unit converts a leakage current signal detected by the current transformer into a first voltage; and the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage.
Optionally, the current transformer includes 3 primary windings and 1 secondary winding, and the 3 primary windings are respectively connected in series in each phase of motor driving loop; the leakage current conversion unit comprises a second resistor and a second rectifier bridge; the second resistor is connected with two ends of the secondary winding, the input end of the second rectifier bridge is connected with two ends of the second resistor, the high-voltage output terminal of the second rectifier bridge is connected with the leakage current protection control unit, and the low-voltage output terminal of the second rectifier bridge is connected to the ground.
Optionally, the leakage current conversion unit further includes a second capacitor, a third resistor, a third capacitor, and a fourth resistor;
the second capacitor is connected with two ends of the secondary winding, the third resistor and the third capacitor are connected in parallel, and two ends of the third resistor and the third capacitor are respectively connected with the ground and a high-voltage output terminal of the second rectifier bridge;
the fourth resistor is connected between the high-voltage output terminal of the second rectifier bridge and the leakage current protection control unit.
Optionally, the leakage current protection control unit includes a comparator and a hardware protection unit, where the hardware protection unit includes a control chip; the control chip is used for outputting a control signal for controlling the motor drive control unit and comprises a protection port; the comparison end of the comparator is connected to the output end of the leakage current conversion unit and used for receiving the first voltage; the reference end of the comparator is connected to a threshold voltage, and is used for comparing with the first voltage and outputting a comparison signal to the protection port.
Optionally, the leakage current protection control unit includes a software protection module; the software protection module comprises a central processing chip, the central processing chip comprises a signal receiving port, and the signal receiving port is connected to the output end of the leakage current conversion unit and receives the first voltage; the central processing chip outputs a signal to the control chip according to the first voltage.
Optionally, the controller further includes a boost circuit, the boost circuit includes an inductor, a first diode, and a first switching tube, one end of the inductor is connected to the high voltage output terminal of the first rectifier bridge, the other end of the inductor is connected to the first end of the first switching tube and the anode of the first diode, the second end of the first switching tube is connected to the low voltage output terminal of the first rectifier bridge, the cathode of the first diode is connected to the high voltage end of the first capacitor, and the control end of the first switching tube is connected to the switching tube control unit.
Optionally, the first resistor comprises a thermistor, and the controller further comprises a relay; the relay is connected with the thermistor in parallel.
Optionally, the motor drive control unit includes a three-phase motor drive circuit including 6 IGBTs and 6 freewheeling diodes connected in parallel with the IGBTs respectively.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a controller, wherein when the sum of currents induced by a current transformer is not zero, a leakage current protection control unit can turn off a controllable switch tube, so that the aim of protecting the controller or/and a motor is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a controller according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another controller according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another controller according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a controller, which has two implementation modes, wherein the two implementation modes are that the positions of a leakage current conversion unit and a leakage current protection control unit are different, and the two implementation modes are respectively introduced.
Referring to fig. 1, a first controller structure may include:
the current transformer CT1, a leakage current conversion unit, a leakage current protection control unit, a first resistor R1, a first rectifier bridge DB1, a first capacitor E1 (such as an electrolytic capacitor) and a motor drive control unit; the motor drive control unit is connected with the motor M.
The power supply input end is used for accessing a power supply; referring to fig. 2, the power supply may be a chinese commercial power supply (first power supply), the voltage is 220V, and at this time, the power supply input end is connected to two ends of the chinese commercial power supply L-N; or the commercial power supply (second power supply) in europe and america, where the power input terminal is connected to two terminals L1-L2 of the commercial power supply in europe and america, and the voltage is 230V.
The primary winding of the current transformer CT1 is connected in series between the power input terminal and the input side of the first rectifier bridge DB 1;
the first capacitor E1 is connected in parallel with a motor driving control unit, and the motor driving control unit is used for connecting a motor M; the motor drive control unit comprises a controllable switch tube and a freewheeling diode connected with the controllable switch tube in parallel; the controllable switch tube may be an insulated gate bipolar transistor IGBT.
The first capacitor E1 is connected at the output side of the first rectifier bridge DB1, and the first resistor R1 is connected between the power input terminal and the first capacitor E1; the first resistor R1 is used to prevent the first capacitor E1 from being directly connected to the power supply, which may cause the first capacitor E1 to be damaged, when the first capacitor E1 is charged.
A secondary winding of the current transformer CT1 is connected to a leakage current converting unit, which converts a leakage current signal detected by the current transformer CT1 into a first voltage; the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage.
In one embodiment, referring to fig. 2, the current transformer CT1 may include 2 primary windings and 1 secondary winding, wherein 1 primary winding is connected between the positive power supply terminal L/L1 and the first input terminal 2 of the first rectifier bridge DB1, and the other primary winding is connected between the negative power supply terminal N/L2 and the second input terminal 3 of the first rectifier bridge DB 1; the leakage current conversion unit comprises a second resistor R2 and a second rectifier bridge DB 2; the second resistor R2 is connected in parallel with the secondary winding, the input end of the second rectifier bridge DB2 is connected to both ends of the second resistor R2, the high voltage output terminal 1 of the second rectifier bridge DB2 is connected to the leakage current protection control unit, and the low voltage output terminal 4 of the second rectifier bridge DB2 is connected to the ground.
Referring to fig. 3, the second controller structure may include:
the motor driving circuit comprises a power supply input end, a current transformer CT2, a leakage current conversion unit, a leakage current protection control unit, a first resistor R1, a first rectifier bridge DB1, a first capacitor E1 (also called as an electrolytic capacitor) and a motor driving control unit;
the power supply input end is used for accessing a power supply; referring to fig. 4, the power supply may be a chinese commercial power supply (first power supply), the voltage is 220V, and at this time, the power supply input end is connected to two ends of the chinese commercial power supply L-N; or the commercial power supply (second power supply) in europe and america, where the power input terminal is connected to two terminals L1-L2 of the commercial power supply in europe and america, and the voltage is 230V.
The primary winding of the current transformer CT2 is connected in series between the motor drive control unit and the motor M;
the first capacitor E1 is connected in parallel with a motor driving control unit, and the motor driving control unit is used for connecting a motor M; the motor drive control unit comprises a controllable switch tube and a freewheeling diode connected with the controllable switch tube in parallel;
the first capacitor E1 is connected to the output side of the first rectifier bridge DB1, and the first resistor R1 is connected between the power input terminal and the first capacitor E1, so as to prevent the first capacitor E1 from being directly connected to the power supply when the first capacitor E1 is charged, which may cause the first capacitor E1 to be damaged.
A secondary winding of the current transformer CT2 is connected to a leakage current converting unit, which converts a leakage current signal detected by the current transformer CT2 into a first voltage; the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage. The two structures are different in that the current transformer CT1 in the first structure detects induced current at the input end of a power supply, the current transformer CT2 in the second structure detects induced current at the input end of a motor, and the leakage current protection control units have the same control function and are all used for controlling controllable switching tubes in the motor drive control unit.
Referring to fig. 4, the current transformer CT2 includes 3 primary windings and 1 secondary winding, and the 3 primary windings are respectively connected in series in each phase motor driving loop; the leakage current conversion unit comprises a second resistor R2 and a second rectifier bridge DB 2; the second resistor R2 is connected to two ends of the secondary winding, the input end of the second rectifier bridge DB2 is connected to two ends of the second resistor R2, the high voltage output terminal 1 of the second rectifier bridge DB2 is connected to the leakage current protection control unit, and the low voltage output terminal 4 of the second rectifier bridge DB2 is connected to the ground.
For any one of the above two controller structures, referring to fig. 2 and 4, the leakage current converting unit further includes a second capacitor C2, a third resistor R3, a third capacitor C3, and a fourth resistor R4;
the second capacitor C2 is connected with two ends of the secondary winding, the third resistor R3 and the third capacitor C3 are connected in parallel, and two ends of the third resistor R3 and the third capacitor C3 are respectively connected with the ground and the high-voltage output terminal 1 of the second rectifier bridge DB 2;
the fourth resistor R4 is connected between the high voltage output terminal 1 of the second rectifier bridge DB2 and the leakage current protection control unit.
Wherein, R3// C3 constitutes an RC filter circuit, and the first voltage can be obtained more accurately through the filter circuit. The fourth resistor is an impedance matching resistor.
In addition, in one embodiment, the leakage current protection control unit includes a comparator U1 and a hardware protection unit, the hardware protection unit includes a control chip IC 1; the control chip IC1 is used for outputting control signals for controlling the motor drive control unit, and the control chip IC1 comprises a protection port FO; the comparison end of the comparator U1 is connected to the output end of the leakage current conversion unit and used for receiving a first voltage; the reference terminal of the comparator U1 is connected to a threshold voltage for comparing with the first voltage and outputting a comparison signal to the protection port FO. Specifically, taking the IC1 in fig. 2/4 as an example, when a leakage occurs, an induced voltage is generated on the secondary winding of the current transformer, and at this time, the leakage current converting unit generates a first voltage, the comparator U1 compares the first voltage with a set threshold voltage, and when the first voltage is greater than the threshold voltage, it is proved that the leakage occurs, and the comparator U1 outputs a high level. After receiving the high-level comparison signal, the protection port FO of the control chip IC1 outputs a control signal for turning off the M1-M6 switching tube. The hardware protection unit can realize the quick response of the leakage protection, improve the protection effect and enhance the reliability of the controller.
In another embodiment, the leakage current protection control unit may further include a software protection module; the software protection module comprises a central processing chip MCU, the central processing chip MCU comprises a signal receiving port AIN0, and the signal receiving port AIN0 is connected to the output end of the leakage current conversion unit and receives a first voltage; the central processing chip MCU outputs a signal to the control chip IC1 according to the first voltage. Taking the MCU shown in fig. 2/4 as an example, the output terminals (P00-P06) of the MCU are connected to the input terminals (HIN1, HIN2, HIN3, LIN1, LIN2 and LIN3) of the IC1 via UVWXYZ lines, respectively; the output terminals (HO1, HO2, HO3, LO1, LO2 and LO3) of IC1 are respectively connected with the gate of each IGBT; the number of the output ends of the MCU, the input ends of the IC1, and the output ends of the IC1 is the same as the number of the IGBTs, respectively, and is six in this embodiment. When electric leakage occurs, the leakage current conversion unit generates a first voltage, namely the AIN0 port of the MCU detects voltage change, if the voltage detected by the AIN0 port exceeds a set threshold value, the driving signal output to the control chip IC1 is turned off through software, the IGBT driving signal is further turned off, and the IGBT is protected from being damaged.
Specifically, in the operation process of the controller, the high-power switch IGBT module for controlling the motor M may be damaged or the motor M may be broken by a large current due to poor insulation between the coil inside the motor M and the housing, or due to a leakage current generated by the damage of the driving wire harness and the contact with the system metal.
In order to protect the IGBT or the motor M from being damaged by leakage current generated due to poor insulation of the motor M or a driving wire harness of the motor M, a current transformer CT1 is added at the input end of a power supply or a current transformer CT2 is added at the control end of the motor M.
Taking fig. 2 as an example, the current direction indicated by the solid arrow in fig. 2 is the flow direction of the current in the wire harness passing through the current transformer CT1, and is obtained according to the circuit principle and the characteristics of the current transformer, when the circuit normally operates, I1+ I2 flowing through the current transformer CT1 is 0, and the voltage signal (first voltage) output after the current signal sampled by the current transformer CT1 is rectified and filtered is zero; when the motor M or the driving wire harness has leakage current to the ground, I1+ I2 which flows through the current transformer CT1 is not equal to 0, and the current induced by the current transformer CT1 is converted to output a leakage current signal (first voltage); the AIN0 mouth of MCU can detect the voltage variation, if the voltage that detects exceeds the threshold voltage that sets for, MCU will turn off the drive signal of output to IC1, further turn off IGBT drive signal, protect IGBT and motor M not damaged. The comparator U1 outputs a high level control FO to directly turn off the IGBT driving signal by comparing the input first voltage signal at the "+" terminal with the threshold voltage at the "-" terminal, so as to protect the IGBT module and the motor M.
In addition, the working process of the current transformer CT2 arranged at the motor control end is similar, and specifically, in the running process of the controller, the high-power switch IGBT module for controlling the motor M may be damaged due to poor insulation between the coil inside the motor M and the housing, or due to leakage current generated by damage of the driving wire harness and contact with system metal, or the motor M may be broken by a large current.
In order to protect the IGBT or the motor M from being damaged by leakage current generated by poor insulation of the motor M or a driving wire harness of the motor M, a current transformer CT2 is added at the control end of the motor M.
In fig. 4, the current direction indicated by an arrow is the flow direction of the current in the wire harness passing through the current transformer CT2, which is obtained according to the circuit principle and the characteristics of the current transformer, when the circuit normally operates, I1+ I2+ I3 flowing through the current transformer CT2 is 0, and the voltage signal output after the current signal sampled by the current transformer CT2 is rectified and filtered is zero; when the motor M or the driving wire harness has leakage current to the ground, I1+ I2+ I3 which flows through the current transformer CT2 is not equal to 0, and the current induced by the current transformer CT2 is converted to output a voltage signal; software in the figure: the AIN0 mouth of MCU can detect the voltage variation, if the voltage that detects exceeds the threshold voltage that sets for, MCU will turn off the drive signal of output to IC1, further turn off IGBT drive signal, protect IGBT not receive the damage. In the hardware part of the figure, the IC2 outputs a high level control FO to directly turn off the IGBT driving signal by comparing the input signal of the "+" terminal with the "-" terminal reference voltage (threshold voltage), so as to protect the IGBT module and the motor M.
In this embodiment, the current transformer is used to detect the leakage current, and when the sum of the currents induced by the current transformer is not zero, the leakage current protection control unit may turn off the controllable switch tube in the motor drive control unit, thereby achieving the effect of protecting the controller or the motor.
Further, referring to fig. 2, the controller further includes a boost circuit including an inductor L, a first diode D1 and a first switch tube K1, one end of the inductor L is connected to the high voltage output terminal 1 of the first rectifier bridge DB1, the other end of the inductor L is connected to the first end of the first switch tube K1 and the anode of the first diode D1, the second end of the first switch tube K1 is connected to the low voltage output terminal 4 of the first rectifier bridge DB1, the cathode of the first diode D1 is connected to the high voltage end of the first capacitor E1, and the control end of the first switch tube K1 is connected to the switch tube control unit. The first switch tube K1 is a PFC main switch tube.
Further, the first resistor comprises a thermistor PTC1, and the controller further comprises a relay RY 1; the relay RY1 is connected in parallel with the thermistor PTC 1.
Referring to fig. 2 or 4, the coil of the relay RY1 is connected to the controller MCU-P01 and the high level VCC, respectively; the first end of the PTC1 and the first end of the RY1 are respectively connected with the positive electrode L/L1 of the power supply; the second end of PTC1 and the second end of RY1 are connected to first input terminal 2 of rectifier bridge DB1, respectively.
In addition, the motor drive control unit comprises a three-phase motor drive circuit consisting of 6 IGBTs and 6 freewheeling diodes respectively connected in parallel with the IGBTs.
The cathode of the first diode D1 and the common end of the electrolytic capacitor (first capacitor) E1 are connected to the collector of the first IGBT M1, the collector of the third IGBT M3, and the collector of the fifth IGBT M5; the emitter of the second IGBT M2, the emitter of the fourth IGBT M4, and the emitter of the sixth IGBT M6 are connected to the common terminal of the low voltage output terminal 4 of the first rectifier bridge DB1 and the electrolytic capacitor E1;
the emitter of the first IGBT M1, the emitter of the third IGBT M3, the emitter of the fifth IGBT M5, the collector of the second IGBT M2, the collector of the fourth IGBT M4 and the collector of the sixth IGBT M6 are connected to the three-phase winding of the motor M, namely M1-M6 form a three-phase inverter circuit for driving the motor.
In another embodiment, the motor drive control unit and the hardware protection unit may also be integrated, such as being centralized in an IPM (Intelligent Power Module).
In this embodiment, set up the boost circuit, can make the voltage regulation ability of controller better, set up current transformer, when taking place the electric leakage, produce the induced voltage of electric leakage, and convert induced voltage into first voltage through the electric leakage conversion unit, the hardware protection module or the software protection module in the electric leakage protection the control unit carry out earth leakage protection according to first voltage, specifically can be for turning off the controllable switch tube (like the IGBT) in the motor drive the control unit, thereby protection motor or controller (especially IGBT module) can not damage because of taking place the electric leakage.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A controller is characterized by comprising a power supply input end, a current transformer, a leakage current conversion unit, a leakage current protection control unit, a first resistor, a first rectifier bridge, a first capacitor and a motor drive control unit;
the power supply input end is used for accessing a power supply;
the primary winding of the current transformer is connected in series between the power input end and the input side of the first rectifier bridge;
the first capacitor is connected with the motor drive control unit in parallel, and the motor drive control unit is used for being connected with a motor; the motor drive control unit comprises a controllable switching tube and a freewheeling diode connected with the controllable switching tube in parallel;
the first capacitor is connected to the output side of the first rectifier bridge, and the first resistor is connected between the power input end and the first capacitor;
a secondary winding of the current transformer is connected to a leakage current conversion unit, and the leakage current conversion unit converts a leakage current signal detected by the current transformer into a first voltage; and the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage.
2. The controller of claim 1, wherein said current transformer includes 2 primary windings and 1 secondary winding, wherein 1 of said primary windings is connected between said positive power supply terminal and a first input terminal of said first rectifier bridge, and another of said primary windings is connected between said negative power supply terminal and a second input terminal of said first rectifier bridge; the leakage current conversion unit comprises a second resistor and a second rectifier bridge; the second resistor is connected with two ends of the secondary winding, the input end of the second rectifier bridge is connected with two ends of the second resistor, the high-voltage output terminal of the second rectifier bridge is connected with the leakage current protection control unit, and the low-voltage output terminal of the second rectifier bridge is connected to the ground.
3. A controller is characterized by comprising a power supply input end, a current transformer, a leakage current conversion unit, a leakage current protection control unit, a first resistor, a first rectifier bridge, a first capacitor and a motor drive control unit;
the power supply input end is used for accessing a power supply;
the primary winding of the current transformer is connected in series between the motor drive control unit and the motor;
the first capacitor is connected with the motor drive control unit in parallel, and the motor drive control unit is used for being connected with the motor; the motor drive control unit comprises a controllable switching tube and a freewheeling diode connected with the controllable switching tube in parallel;
the first capacitor is connected to the output side of the first rectifier bridge, and the first resistor is connected between the power input end and the first capacitor;
a secondary winding of the current transformer is connected to a leakage current conversion unit, and the leakage current conversion unit converts a leakage current signal detected by the current transformer into a first voltage; and the leakage current protection control unit is connected with the leakage current conversion unit and used for receiving the first voltage and outputting a drive control signal for controlling the motor drive control unit according to the first voltage.
4. The controller of claim 3, wherein the current transformer comprises 3 primary windings and 1 secondary winding, the 3 primary windings being connected in series in each phase motor drive loop respectively; the leakage current conversion unit comprises a second resistor and a second rectifier bridge; the second resistor is connected with two ends of the secondary winding, the input end of the second rectifier bridge is connected with two ends of the second resistor, the high-voltage output terminal of the second rectifier bridge is connected with the leakage current protection control unit, and the low-voltage output terminal of the second rectifier bridge is connected to the ground.
5. The controller according to any one of claims 1 to 4, wherein the leakage current converting unit further comprises a second capacitor, a third resistor, a third capacitor, and a fourth resistor;
the second capacitor is connected with two ends of the secondary winding, the third resistor and the third capacitor are connected in parallel, and two ends of the third resistor and the third capacitor are respectively connected with the ground and a high-voltage output terminal of the second rectifier bridge;
the fourth resistor is connected between the high-voltage output terminal of the second rectifier bridge and the leakage current protection control unit.
6. The controller according to claim 5, wherein the leakage current protection control unit comprises a comparator and a hardware protection unit, and the hardware protection unit comprises a control chip; the control chip is used for outputting a control signal for controlling the motor drive control unit and comprises a protection port; the comparison end of the comparator is connected to the output end of the leakage current conversion unit and used for receiving the first voltage; the reference end of the comparator is connected to a threshold voltage, and is used for comparing with the first voltage and outputting a comparison signal to the protection port.
7. The controller according to claim 6, wherein the leakage current protection control unit comprises a software protection module; the software protection module comprises a central processing chip, the central processing chip comprises a signal receiving port, and the signal receiving port is connected to the output end of the leakage current conversion unit and receives the first voltage; the central processing chip outputs a signal to the control chip according to the first voltage.
8. The controller of claim 1 or 3, further comprising a boost circuit, wherein the boost circuit comprises an inductor, a first diode and a first switch tube, one end of the inductor is connected to the high voltage output terminal of the first rectifier bridge, the other end of the inductor is connected to the first end of the first switch tube and the anode of the first diode, the second end of the first switch tube is connected to the low voltage output terminal of the first rectifier bridge, the cathode of the first diode is connected to the high voltage end of the first capacitor, and the control end of the first switch tube is connected to the switch tube control unit.
9. A controller according to claim 1 or 3, wherein the first resistor comprises a thermistor, the controller further comprising a relay; the relay is connected with the thermistor in parallel.
10. A controller according to claim 1 or 3, wherein the motor drive control unit comprises a three-phase motor drive circuit consisting of 6 IGBTs and 6 freewheeling diodes connected in parallel therewith respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911039390.2A CN110729702A (en) | 2019-10-29 | 2019-10-29 | Controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911039390.2A CN110729702A (en) | 2019-10-29 | 2019-10-29 | Controller |
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| CN110729702A true CN110729702A (en) | 2020-01-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
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